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Loans held for sale (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans held for sale, at fair value | $ 899,173 | $ 262,518 |
Mortgage Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Net gains (losses) from fair value changes of mortgage loans | 24,233 | (2,861) | $ (4,539)
Commercial and industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Net gains (losses) from fair value changes of mortgage loans | 3,228 |  |
Loans held for sale, at fair value | 215,403 | 0 |
Residential real estate | 1-to-4 family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans held for sale, at fair value | $ 683,770 | $ 262,518 |

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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